A5046337307- Nuclear physics research studies
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Quantum, superfluid, helium dynamics
- High-Energy Particle Collisions Research
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Advanced Chemical Physics Studies
- X-ray Spectroscopy and Fluorescence Analysis
- Electron and X-Ray Spectroscopy Techniques
- Particle Accelerators and Free-Electron Lasers
- Crystallography and Radiation Phenomena
- Medical Imaging Techniques and Applications
- Particle accelerators and beam dynamics
- Physics of Superconductivity and Magnetism
- Advanced NMR Techniques and Applications
- Quantum chaos and dynamical systems
- Superconducting Materials and Applications
- Spectroscopy and Quantum Chemical Studies
- Radiation Therapy and Dosimetry
- Chemical Reactions and Isotopes
- Photocathodes and Microchannel Plates
- Scientific Research and Discoveries
Ruhr University Bochum
2023
National and Kapodistrian University of Athens
2023
University of Massachusetts Amherst
1991-2009
Florida State University
2006
Kurchatov Institute
1993
University of New Hampshire
1993
University of Colorado Boulder
1993
University of Illinois Urbana-Champaign
1990-1991
Massachusetts Institute of Technology
1980-1991
Wittenberg University
1991
Inclusive cross sections for the proton and nuclear targets of A=4, 9, 12, 16 were measured 537 730 MeV electrons scattered at 37.1 deg. Systematic features continuum scattering data are compared with other electron photoabsorption measurements. A model calculation based on isobar-hole formalism is in delta resonance region.
The inelastic electron-scattering cross sections of H, He, Be, C, and O were measured for 730-MeV electrons scattered at 37.1\ifmmode^\circ\else\textdegree\fi{} energy transfers to the nucleus up 550 MeV. nuclear response in delta region is found be quite similar $A>1$ targets. Although differential section per nucleon peak (380 MeV) suppressed compared that free nucleon, area 230-550-MeV enhanced
All available $B(E2)$ values in the mass region $8\ensuremath{\le}Z$, $N\ensuremath{\le}20$ relevant to isovector electric quadrupole operator are compared theoretical based on Chung-Wildenthal $0{d}_{\frac{5}{2}}\ensuremath{-}1{s}_{\frac{1}{2}}\ensuremath{-}0{d}_{\frac{3}{2}}$ shell-model wave functions with harmonic oscillator radial functions, and some selected cases local energy dependent Woods-Saxon potential functions. The empirical effective charges deduced from these comparisons...
We have measured a new electron scattering observable, the “fifth” structure function, f01′, which is imaginary part of transverse-longitudinal interference response. Its observation requires longitudinally polarized beam and coincident, out-of-plane particle detection. f01′ arises from between reaction channels provides an additional means for their disentanglement. In quasielastic C12(e→,e′p) measurements reported here, driven by direct knockout rescattering amplitudes.Received 1 March...
The GlueX experiment at Jefferson Lab studies photoproduction of mesons using linearly polarized 8.5GeV photons impinging on a hydrogen target which is contained within detector with near-complete coverage for charged and neutral particles. We present measurements spin-density matrix elements the vector meson ρ(770). statistical precision achieved exceeds that previous experiments in this energy range by orders magnitude. confirm high degree s-channel helicity conservation small squared...
New data are presented on the p(e,e'p)pi(0) reaction at threshold a four-momentum transfer of Q(2) = 0.05 GeV(2)/c(2). The were taken with three-spectrometer setup A1 Collaboration Mainz Microtron MAMI. complete center mass solid angle was covered up to energy 4 MeV above threshold. Combined measurements three different values virtual photon polarization epsilon, structure functions sigma(T), sigma(L), sigma(TT), and sigma(TL) determined. results compared calculations in heavy baryon chiral...
Hadron scattering is shown to be sensitive the relative sign of neutron and proton transition matrix elements. The signs for ${2}_{2}^{+}$ states are determined positive $^{26}\mathrm{Mg}$, $^{30}\mathrm{Si}$, $^{42}\mathrm{Ca}$, negative $^{34}\mathrm{S}$ on basis differential cross-section measurements at 650 800 MeV. Suppression one-step amplitude in state causes interference multistep reactions experimentally apparent.
Differential cross sections for $^{10}\mathrm{B}$($\ensuremath{\gamma}$, ${\ensuremath{\pi}}^{+}$)$^{10}\mathrm{Be}$ to the ground and first excited states of $^{10}\mathrm{Be}$ separately $^{16}\mathrm{O}$($\ensuremath{\gamma}$ ${\ensuremath{\pi}}^{+}$,)$^{16}\mathrm{N}$ sum four lowest-lying in $^{16}\mathrm{N}$ have been measured at laboratory angles 45\ifmmode^\circ\else\textdegree\fi{} 90\ifmmode^\circ\else\textdegree\fi{} pions with kinetic energies from 80 210 MeV. The results, which...
We have separated the longitudinal (f00), transverse (f11), and longitudinal-transverse interference (f01) structure functions in 2H(e,e′p)n reaction at |q→|≈400MeV/c ω≈110MeV. A nonrelativistic calculation which includes effects due to final state interactions, meson exchange currents, isobar configurations agrees with measured f11 f01 but overpredicts f00 by 25% ( 2σ). The data are also compared results of previous function measurements.Received 24 July...
Measurements of the (2)H((-->)e,e(')p)n reaction were performed with out-of-plane magnetic spectrometers (OOPS) at MIT-Bates Linear Accelerator. The longitudinal-transverse, f(LT) and f(')(LT), transverse-transverse, f(TT), interference responses a missing momentum 210 MeV/c simultaneously extracted in dip region Q2 = 0.15 (GeV/c)(2). In comparison to models deuteron electrodisintegration, data clearly reveal strong effects relativity final-state interactions importance two-body...
New electron scattering measurements have been made that extend data on the ${}^{3}\mathrm{He}$ elastic magnetic form factor up to ${Q}^{2}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}42.6{\mathrm{fm}}^{\ensuremath{-}2}$. These new test theoretical conjectures regarding non-nucleonic effects in three-body system. The very small cross sections, as low ${10}^{\ensuremath{-}40}{\mathrm{cm}}^{2}/\mathrm{sr}$, required use of a high-pressure cryogenic gas target and detector system with...
Cross sections were measured for the near-threshold electrodisintegration of 3He at momentum transfer values q=2.4, 4.4, and 4.7fm−1. From these prior measurements transverse longitudinal response functions RT RL deduced. Comparisons are made against previously published new nonrelativistic A=3 calculations using best available nucleon-nucleon NN potentials. In general, q<2fm−1 accurately predict threshold 3He. Agreement increasing q demands consideration two-body terms, but discrepancies...
We have measured the coincidence d(e→,e′p) reaction in quasielastic scattering, detecting proton a noncoplanar geometry. The electron helicity asymmetry Ae and imaginary part of longitudinal-transverse interference structure function f′LT been determined at four-momentum transfer Q2=3.3 fm−2. results are compared with theoretical calculations which use realistic potentials for NN interaction.Received 1 September 1994DOI:https://doi.org/10.1103/PhysRevC.51.3479©1995 American Physical Society
Multiple proton and pion electroproduction from nuclei are studied. Final states including at least two protons produced by the interaction of 14.5 GeV electrons positrons with light (mainly $^{12}\mathrm{C}$ $^{16}\mathrm{O}$) have been measured, compared analogous data $^{40}\mathrm{Ar}$. Scattered were detected in energy transfer range 0.2 to 12.5 GeV, four-momentum squared 0.1 5.0 ${\mathrm{GeV}}^{2}$/${\mathit{c}}^{2}$. Phenomenological characteristics secondary hadron production cross...
Elastic electron scattering cross sections have been measured for $^{89}\mathrm{Y}$ at 180\ifmmode^\circ\else\textdegree\fi{} 0.72q2.67 ${\mathrm{fm}}^{\mathrm{\ensuremath{-}}1}$. The M1 form factor has extracted and a Fourier-Bessel analysis performed to obtain the ground-state magnetization density. Calculations including effects of core polarization within framework finite Fermi system theory. These show weakening strong repulsion in spin-isospin channel are overall agreement with data.
The giant multipole resonances in $^{116}\mathrm{Sn}$ have been studied using the (e,e'n) reaction. Data were taken at effective momentum transfers of 0.37, 0.45, and 0.55 ${\mathrm{fm}}^{\mathrm{\ensuremath{-}}1}$ a analysis data was performed. inferred strength functions identify E2 E0 as distinct peaks 12.2 17.9 MeV, respectively. energy-weighted sum-rule strengths for resonances, obtained Lorentzian fit to data, are 34\ifmmode\pm\else\textpm\fi{}13% 93\ifmmode\pm\else\textpm\fi{}37%....
The coincidence cross section and the interference structure function, RLT, were measured for 12C(e,e′p)11B reaction at quasielastic kinematics central momentum transfer of |q→|=400MeV/c. measurement was an opening angle θpq=11°, covering a range in missing energy Em=0 to 65 MeV. RLT function is found be consistent with zero Em>50MeV, confirming earlier study which indicated that RL vanishes this region. integrated strengths p- s-shell are compared distorted wave impulse approximation (DWIA)...
We report the measurement of spin-density matrix elements $\Delta^{++}(1232)$ in photoproduction reaction $\gamma p \to \pi^-\Delta^{++}(1232)$ with GlueX experiment Hall D at Jefferson Lab. The used a linearly polarized photon beam $E_\gamma=8.2-8.8$~GeV and statistical precision exceeds previous from SLAC by three orders magnitude for momentum transfer squared region $-t < 1.4$ GeV$^2$. data are sensitive to previously undetermined relative sign between couplings existing Regge exchange...
Proton and neutron transition densities in $^{30}\mathrm{Si}$ are examined by a combination of intermediate energy (e,e') (p,p') reactions mirror electromagnetic rates. This analysis is performed for the ${2}_{1}^{+}$ ${2}_{2}^{+}$ states at 2.234 3.499 MeV $^{30}\mathrm{Si}$. Electron scattering data presented these states. Shell-model calculations proton matrix elements compared with results. The reasonably predicted state but not adequately state. A microscopic coupled-channel calculation...